Electrochemical Corrosion Behavior of Extruded Dilute Mg-2Sn-1Al-1Zn Alloy in Simulated Body Fluid

doi:10.11902/1005.4537.2019.226

Journal of Chinese Society for Corrosion and protection

2020, Vol. 40

Issue (2): 146-150 DOI: 10.11902/1005.4537.2019.226

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Electrochemical Corrosion Behavior of Extruded Dilute Mg-2Sn-1Al-1Zn Alloy in Simulated Body Fluid

ZHANG Yao¹, GUO Chen¹, LIU Yanhui¹, HAO Meijuan¹, CHENG Shiming¹, CHENG Weili¹^,²(

)

1 School of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
2 Shanxi Key Laboratory of Advanced Magnesium-Based Materials, Taiyuan University of Technology, Taiyuan 030024, China

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Abstract

The electrochemical behavior of the extruded dilute Mg-2Sn-1Al-1Zn alloy was examined in simulated body fluid (SBF) by means of electrochemical workstation CS350. While stable open circuit potential, polarization curve and the impedance data after immersion for different time were measured. Results indicate that the stable open circuit potential value was -1.57 V_SCE, the polarization corrosion rate was 8.98 mm/a and the corrosion resistance was 1011.21 Ω·cm². Impedance tests at different time of immersion in simulated body fluids showed that the corrosion resistance first increased and then decreased. Due to the corrosion product layer on the surface of the soaked alloy is the densest after 2 h of immersion, the value of corrosion resistance reached a maximum of 2151.62 Ω·cm².

Key words: magnesium alloy extrusion simulated body fluid electrochemical testing corrosion behavior

Received: 28 April 2019

ZTFLH:

TG174.46

Fund: Shanxi Scholarship Council of China(2014-023);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi(2014017);Natural Science Foundation of Shanxi(201801D121088)

Corresponding Authors: CHENG Weili E-mail: chengweili7@126.com

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Cite this article:

ZHANG Yao, GUO Chen, LIU Yanhui, HAO Meijuan, CHENG Shiming, CHENG Weili. Electrochemical Corrosion Behavior of Extruded Dilute Mg-2Sn-1Al-1Zn Alloy in Simulated Body Fluid. Journal of Chinese Society for Corrosion and protection, 2020, 40(2): 146-150.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2019.226 OR https://www.jcscp.org/EN/Y2020/V40/I2/146

Fig.1 Open circuit potential (a) and potentiodynamic pola-rization curve (b) of the extruded alloy

Table 1 Fitting data of the extruded alloy obtained from the polarization measurement

Fig.2 Nyquist diagram (a), Bode plots of phase angle versus frequency (b) and Bode plots of impedance versus frequency (c) for the extruded alloy

Fig.3 Equivalent circuit of the EIS spectra for the extruded alloy

Table 2 Electrochemical parameters of studied alloys attained from the fits of the experimental EIS data

Fig.4 Hydrogen evolution rate of the extruded TAZ alloys immersed in the SBF solution

Fig.5 Nyquist curves of the extruded alloy immersed in SBF solution for different time intervals

Table 3 Fitting parameters of the extruded alloy obtained from the EIS measurement for different time intervals

Fig.6 Surface SEM micrograph of extruded alloy immersed in the SBF solution for 2.5 h

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